I had a second look at that one, doesn't look like it has external power. (and on newegg it does, perhaps I'll try that one tomorrow) I haven't really bought anything from Rosewill. I always wonder if they're cheap or inexpensive.
The ones I got have magnets on the bottom so they stick to the computer case really well. I like them allot. They are USB 2.0 so you can't hook up a bunch of hard drives to them. I have been underwhelmed by the Anker's, they're crap.